Tata Steel UK launches bacteria-technology to lower emissions

The pilot project has been set up at the two Tata Steel UK Port Talbot ironmaking furnaces in Wales. The project, while still in its infancy, has already shown promising results, the experts involved said last week.

''As the world is coming to terms with the challenges of net-zero CO₂ steel making, there are lots of options to consider. Not only in terms of different steelmaking technologies, but also around any opportunities to capture and use the carbon-based process gases,'' said Dr Rhiannon Chalmers-Brown from the University of South Wales. ''The process we are testing here bubbles off-gases from the blast furnaces through sewage sludge, which contains a certain type of bacteria able to consume both carbon monoxide and carbon dioxide,'' she said.

Dr Chalmers-Brown said the team was getting quite high levels of carbon utilisation, which they feel can increase up to about 98%.

''The waste products from those bacteria include acetic acid and volatile fatty acids which can be used for a huge range of commercially viable end-uses such as paints, bioplastic-polymers or even animal feeds,'' she noted.

The project is a collaboration between Tata Steel and the university exploring how waste gases from the steelmaking processes at Port Talbot can be harnessed and used to support other industries while reducing the amount of CO₂ released.

Dr Chalmers-Brown added: “While this pilot is looking at gases from blast furnaces, pretty much every iron and steelmaking technology emits some carbon-based gases, so this technology has potential to reduce those emissions whichever technology route is eventually chosen. There's still quite a lot of work to do with the pilot reactor, collecting data and to understand what we can about the biological reactions.''

Tata Steel said it is developing detailed plans for this transition to future steelmaking based on low CO₂ technologies.

''This is a great project, which could be a real game-changer and is yet another example of the benefits of working closely with some of our top universities,” said Gareth Lloyd, process engineering manager from Tata Steel and industry sponsor.

Tata Steel in the UK said it has an ambition to produce net-zero steel by 2050 at the latest and to have reduced 30% of CO₂ emissions by 2030. The vast majority of that work will need to happen in South Wales, where the company's largest operational site in the UK is based.